Set in the USA around the turn of the century, this is the story of Judy Abbott, the orphan teenager rescued from an institution and sent to a young ladies' college by a mystery benefactor seen only as a wavering, elongated shadow on the wall and thereafter called Daddylonglegs. Her development from an insecure and volatile girl to confident and attractive young woman, in love for the first time, is amusingly and movingly chronicled in her letters to her unknown guardian.